To clarify these items are part of the new polymorph system, they exist temporarily so poly'ed characters don't lose spells. Maybe a case of a full inventory?

They get checked for and removed though so no worries unless you find a way to make them permanent in which case you are obligated to report them or face the feeble wrath of a thousand kobolds showering you with skewers while screaming loudly "More meat for the kebab god!".